JPH01215218A - Three-set mower - Google Patents

Abstract

PURPOSE: To prevent the clogging state of lawns caused by the track of wheels by asymmetrically arranging respective mowing units while being offset from the center line of a mower just for a specified distance. CONSTITUTION: Mowing units 32, 34 and 36 are positioned asymmetrically to a center line (a) of the mower and positioned symmetrically to a lengthwise line (c) offset through the center of the unit 36 to the right side of the center line (a) just for a distance (d) (>=1/2 wheel width). When the mower is moved forward (reciprocatively) in respective opposite directions along the same mowing course, front wheels or rear wheels pass on the tracks different in case of moving forward and backward.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a reel-type mower, and particularly to a self-propelled triad (i.e., equipped with three reels) suitable for mowing golf course greens. ) Regarding lawn mowers.

(Prior art and its problems) In the method of mowing the grass on golf course greens using a set of three mowers, the grass around the periphery of the green is mowed in the circumferential direction, and the grass on the green is mowed back and forth in a straight line and in parallel before and after that. Cut back and forth.

Traditionally, the reels have been placed symmetrically about the centerline of the mower. The green edge must always be located in the same position, so when mowing the grass around the edge of the green circumferentially with such a mower, the drive and control wheels of the mower will follow the same trajectory each time. As a result, only the grass on the green that corresponds to the trajectory becomes unduly compacted (the grass is clogged). To do this, the operator, i.e. the lawn mower, must avoid changing the starting position,
Care must be taken to ensure that the drive and steering wheels do not follow the same trajectory by changing the angular direction of the reciprocating mowing for each reciprocating mowing cycle.

(Object of the Invention) The general object of the present invention is to mow the grass around the edge of the green in a circumferential direction (both in the case where the grass is mowed back and forth across the green and in parallel). To provide a three-piece self-propelled mower having reel units arranged so as to easily eliminate the clogging of grass caused by the trajectory of the lawn mower.

A more specific object of the present invention is to provide a mower at positions that differ from each other by at least the width of the wheels with respect to the center line of the mower, in order to allow the wheels to follow different paths when changing the direction of mowing the grass around the edge of the green. To provide a triple self-propelled mower having reel units arranged asymmetrically with respect to the centerline of the mower so as to position the reels on both sides of the mower at the same time.

(Structure and Effect of the Invention) The above object is to arrange each mowing unit asymmetrically with respect to the centerline of the mower by a distance equal to at least half the width of one of the front wheels and the rear wheels. This is achieved by providing a lawn mower with

That is, if the mower according to the present invention is moved forward (reciprocating) in opposite directions along the same mowing route, the front wheels and rear wheels will pass different trajectories depending on the outward and return trips. Therefore, the above-mentioned problem of clogging of grass can be solved.

(Example) To explain with reference to the figure, a three-piece self-propelled mower, especially a green lawn mower Ialo, has left and right driving front wheels 14.
．． 16 and a main frame 12 supported by a steering rear axle 18. It goes without saying that instead of a single respective front and rear wheel, each front and rear wheel 14, 16, 18 may also consist of several wheels.
The mower 10 is mounted on the main frame I2 in front of the rear wheels 18.
An engine compartment 20 is provided overlying and surrounding an engine 22. An operator's seat 24 is placed on the main frame 12 between the front wheels 14,16. Platform 2
6 is provided in a cantilevered manner forward from the main frame 12,
A pedestal 28 is supported at its front end. An operator operated steering handle assembly 30 is mounted on the pedestal 28 to facilitate its operation by the operator.

The left and right front mowing units (32, 34) and the central rear mowing unit (36) of the same type are connected to the main frame 12, respectively.
These mowing units cut the grass to a predetermined height before being bent by the wheels.
4. Mow the grass on each route in front of 16.18. Each mowing unit has a frame 38 with a mounting pail 40.
has. Each frame 38 has front and rear rollers 42
．． 44 and also carry a cutting reel 46 located between these rollers. Mowing unit 32.
34 are respectively connected to the main frame 12 by support arms 48 and 50 that protrude left and right. arm 48
．． The inner ends of 50 are each attached to the main frame 12 and extend along a horizontal longitudinal axis defined by a coupling structure 52 located at a lower forward position of the frame offset to the right from the longitudinal centerline a of the mower. It is designed to be able to pivot vertically in imitation. Arm 48.
The outer ends of the mowing units 32,34 are each defined by a cylindrical socket 54.56, each having a longitudinal axis parallel to the longitudinal centerline a. The pail 40 is positioned equidistantly from the stem 60 and both ends of the reel 46.
The arm 48 is connected to the arm 48.50 by a similar swivel 58 having a clevis 62 connected by a pin 64 at the midpoint of the swivel 58. The mowing unit 36 has wheels 14°16
a figure-eight rear section connected at its forward end to the main frame for vertical pivoting about a horizontal transverse axis defined by a pivot connection 68 located proximate a transverse vertical plane extending tangentially to the rear circumference; It is connected to the main frame 12 via a support arm 66 . Support arm 66 carries a socket 70 oriented in a similar position as sockets 54, 56 of arms 48.50 and offset to the right from centerline a.

The stem of another swivel 58 is pivoted to a socket 70;
Its clevis connects to the midpoint of the mounting pail 40 on the frame of the rear mowing unit 36.

The mowing units 32, 34, 36 shown are in a lowered working position and are oriented to cut grass straight ahead. and a mowing unit support arm 48.50.66, which can be selectively lifted to raise the corresponding mowing unit from its working position.

Next, the present invention will be explained in detail with reference to FIG. The mowing units 32, 34, 36 are located asymmetrically with respect to the center line a of the mower, but with respect to a longitudinal line C passing through the center of the rear mowing inlet 36 and offset to the right of the center line a by a distance d. located symmetrically.

The offset distance d shown is equal to half the width of the wheel, and a longitudinal line C is aligned with the right side 72 of the rear wheel 18 and passes through the center of the right and left front mowing units 32, 34, respectively. The longitudinal line r, It is the front wheel 14.1
6, respectively. The offset distance d should be at least the value shown (wheel width + A), but may be greater than the above, as long as the cutting reel has dimensions that overlap appropriately and cut the grass from the path to be followed by the wheels. You can.

Next, the operation of the mower 10 for mowing green grass will be explained. It is better to run the mower clockwise around the green's periphery.The grass has already been mowed clockwise, and now by mowing the grass circumferentially around the periphery of the green, the grass on the green can be moved to the left. Assuming that the mower is to be mowed around the green, the operator positions the mower 8110 to travel counterclockwise around the green.The operator then positions the mower 8110 to travel counterclockwise around the green. so that the right front axle 14 passes through a track adjacent to the track along which the left front axle 16 passed during the previous clockwise mowing operation.

Therefore, unlike in mowing operations with symmetrically arranged mowers, the wheels do not follow the same trajectory in each mowing operation. As a result, there is little to no compacted track tracks created by conventional mowers. After the circumferential mowing of the green is completed, the green is mowed in a linear reciprocating motion by driving the mower back and forth over the green along parallel straight paths.

In this case too, the mowing unit is offset.
Therefore, when the mower is driven in the opposite direction to the direction in which it was driven during the previous lawn mowing operation and the next lawn mowing operation is performed, the wheels will follow a different trajectory from the previous wheel trajectory. . Therefore, the work start position and the angular direction of mowing can be kept the same, which makes the mowing work easier for the operator.

[Brief explanation of the drawing]

FIG. 1 is an inverted side view of a triple mower constructed in accordance with the principles of the present invention, and FIG. 2 is a plan view of the mower of FIG. 1 with details of the reel unit omitted. Description of symbols 10...Mower 12...Main frame 14, 16...Front wheels 18...Rear wheels 32, 34...Front mowing unit 36...Rear mowing unit) 46-... Cutting reel a... Center line of the mower (4 people outside)

Claims (1)

[Scope of Claims] 1. A main frame supported by a pair of front wheels and a rear wheel located symmetrically with respect to the longitudinal center line of the mower, and a main frame configured to operate in front of the pair of front wheels and the rear wheel. and three mowing units each mounted on the main frame and stacked so as to cut grass with a cutting width at least slightly wider than the distance between the outer surfaces of the pair of front wheels. In order to cause the front wheels and the rear wheels to pass on different tracks when changing the mowing direction of the mower to cut grass with a predetermined cutting width, one of the wheels is A mower, characterized in that each mowing unit is asymmetrically positioned offset with respect to the centerline of the mower by a distance equal to at least half the width. 2. A main frame supported by a pair of front wheels located equidistant from the longitudinal center line of the mower and a rear wheel located on the longitudinal center line of the mower, and a main frame in front of the pair of front wheels; a pair of front mowing units supported by the main frame so as to cut grass in front of the rear wheels, and a rear mowing unit supported by the main frame so as to cut grass in front of the rear wheels; three self-propelled mowers whose mowing units overlap when viewed in the direction of the longitudinal centerline of the mower and have a total cutting width at least slightly wider than the distance between the outer surfaces of the front wheels; the mower by a lateral distance equal to at least half the width of one of the wheels so as to be able to operate the mower in both directions along a path without driving the front and rear wheels. A mower characterized in that each mowing unit is arranged asymmetrically with respect to a center line of the mower. 3. A main frame supported by a pair of left and right front wheels and a rear wheel that follow parallel paths during the straight forward movement of the mower, and a main frame configured to cut grass in front of the pair of front wheels. a pair of front mowing units supported by frames; and a rear mowing unit supported by the main frame to mow in front of the rear wheels, the front and rear mowing units being arranged in the direction of the path. In a triple self-propelled mower that visually overlaps and has a total cutting width at least slightly wider than the distance between the outer surfaces of the front wheels, the pair of front mowing units and the rear mowing unit are each parallel to each other. lateral in a first direction from said parallel path, centered along a line and followed by said front and rear wheels a distance not exceeding at least half the width of one of said wheels; A mower characterized by being offset to.